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Electrical Engineering

Issue 6  Part Supplement • Date June 1941

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Displaying Results 1 - 25 of 132
  • [Front cover]

    Publication Year: 1941, Page(s): c1
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    Freely Available from IEEE
  • [Advertisement - Front inside cover]

    Publication Year: 1941, Page(s): c2
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    Freely Available from IEEE
  • Shielding of transmission lines

    Publication Year: 1941, Page(s):313 - 328
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3977 KB)

    MODERN theories of direct-stroke protection premise that the ground wires are so located as to intercept the stroke and provide perfect shielding. In spite of the fundamental importance of this question there still exists considerable doubt as to the correct position of the ground wires relative to the transmission conductors. Two avenues of approach are suggested for the attack of this question; ... View full abstract»

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  • Abnormal voltage conditions in three — Phase systems produced by single-phase switching

    Publication Year: 1941, Page(s):329 - 339
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  • Arcing faults in power systems

    Publication Year: 1941, Page(s):340 - 346
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2645 KB)

    IT has for many years been recognized that voltage surges of considerable magnitude could be produced under certain system conditions by switching operations or by arcing faults. Such voltage surges have been studied in some detail in the past, and various theories have been developed to explain their occurrence and to predict their magnitude. The theories were in most cases sound, but the predict... View full abstract»

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  • Transient analysis of completely transposed multiconductor transmission lines

    Publication Year: 1941, Page(s):346 - 350
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (453 KB)

    Starting with the general equations of the completely transposed n-conductor transmission system expressed in matrix form, the equations are subjected to a similarity transformation. This transformation reduces the general equations to a set of n independent equations. These equations are then subjected to a Laplacian transformation and solved subject to the impression of arbitrary electromotive f... View full abstract»

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  • Linear transformations in three-phase circuits

    Publication Year: 1941, Page(s):351 - 356
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (537 KB)

    A general method of finding linear transformations to eliminate the coupling between substitutive networks is developed. The method is compared with that of symmetrical components and modified symmetrical components and its practical applicability is discussed. View full abstract»

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  • High-voltage D-C point discharges

    Publication Year: 1941, Page(s):356 - 362
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3208 KB)

    D-c corona discharges from pointed and sharp-edged conductors have been found to give rise to severe radio interference on aircraft under certain precipitation conditions. Laboratory studies, employing a point-to-plane arrangement, have shown that these discharges are greatly influenced not only by voltage and polarity but also by the geometry of the points. View full abstract»

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  • Aircraft precipitation-static radio interference

    Publication Year: 1941, Page(s):363 - 370
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    Freely Available from IEEE
  • A wide-band square-wave generator

    Publication Year: 1941, Page(s):371 - 376
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1689 KB)

    A square-wave generator is described which covers a very wide frequency range, is compact, self-contained, and adaptable to many other uses besides the investigation of transient response. The instrument uses a positive-bias type multivibrator. The operation of the multivibrator and clipping circuits are explained. Approximate formulas for the multivibrator frequency and pulse width are derived an... View full abstract»

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  • Harmonic-current-restrained relays for transformer differential protection

    Publication Year: 1941, Page(s):377 - 382
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2000 KB)

    Differential protection, employing percentage-differential relays, has1 long been the accepted method of fault protection for large power transformers. This method, illustrated by the schematic diagram, figure 1, is quite satisfactory in most respects but is subject to false tripping on the transient magnetizing-inrush current which flows when the transformer is energized. This current,... View full abstract»

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  • Medium-capacity air-blast circuit breakers for metal-clad switchgear

    Publication Year: 1941, Page(s):383 - 388
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2697 KB)

    The cross-blast principle of arc interruption has been shown to provide maximum air economy; consequently this method of interruption is well suited for use in an air-blast breaker that must conform to the rigid space requirements and small phase spacings encountered in medium-capacity metal-clad equipment. View full abstract»

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  • Dielectric strength of water in relation to use in circuit interrupters

    Publication Year: 1941, Page(s):389 - 395
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    This paper describes the behavior of water as a dielectric, in particular with reference to its use in water circuit breakers. View full abstract»

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  • Superposition methods (or calculating effects of additions to power systems

    Publication Year: 1941, Page(s):396 - 401
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (585 KB)

    Outline of a group of methods that will permit calculation of all the common changes on power-system networks by superposition methods having as a basis the representation of loads as fixed currents. Investigation of the errors involved, and comparison with results obtained by assuming constant-impedance loads, when applied to the average power-system networks in operation today. View full abstract»

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  • A double-break oil- or gas-blast power fuse

    Publication Year: 1941, Page(s):402 - 407
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    The use of two fuse elements of different rating, in series, in a high-voltage fuse device is described in this paper. The two elements are placed in a tube and the tube is filled with an arc-extinguishing substance and sealed; one end with an expellable plug. View full abstract»

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  • Capacitors and circuit performance

    Publication Year: 1941, Page(s):408 - 415
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    Considerable literature has appeared in the technical press during the past few years describing and analyzing the application of capacitors. Naturally, each author has treated the particular phase of the subject that best accomplished his objectives. It is felt, however, that a large majority of the potential users, and probably a good many of the actual users of capacitors, do not fully apprecia... View full abstract»

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  • Some acceleration tests on large synchronous pump motors

    Publication Year: 1941, Page(s):416 - 422
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    Acceleration tests on motors may yield very interesting and valuable information. These tests show the behavior of the motor in that region between zero speed and full speed through which each motor must pass every time it is started. The usual tests do not cover this range. In fact, it is difficult or impossible to obtain the actual motor characteristics in this range on many motors by any other ... View full abstract»

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  • A generalized equivalent circuit in the theory of polyphase commutator motors

    Publication Year: 1941, Page(s):423 - 431
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (770 KB)

    The demand for speed variation and power-factor compensation in a-c motors led to the development of the polyphase commutator types. In their simplest form these motors consist of two windings; a stator winding which is identical with that of the polyphase induction motor and a rotor winding of the closed type provided with a commutator and similar to the winding of a d-c armature. The field and a... View full abstract»

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  • Braking magnets for watt-hour meters

    Publication Year: 1941, Page(s):431 - 439
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1844 KB)

    The function of a braking magnet for a watt-hour meter is to produce a retarding torque acting to balance the electromagnetic driving torque. This retarding torque must be strictly proportional to the velocity of the disk for the watt-hour meter to register accurately. This is readily seen from a consideration of the fundamental watt-hour meter equation.1 View full abstract»

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  • The vertical-flow interrupter and its application to “oil-poor” circuit breakers

    Publication Year: 1941, Page(s):440 - 445
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    The historical background of the development of the vertical-flow interrupter for “oil-poor” circuit breakers is reviewed. A description of the interrupter and its theory of operation is given. The application of two of these interrupters to a 138-kv 1 1/2-nillion-kva “oil-poor” porcelain-clad circuit breaker is shown, together with laboratory test results. View full abstract»

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  • The “black band” method of commutation observation

    Publication Year: 1941, Page(s):446 - 451
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    Good commutation is essential for the reliable performance of d-c machines with low maintenance costs. As an aid to the commutation adjustment of machines in the factory, or in the field, a systematic test procedure has been found useful on large machines to indicate certain features of the machine's adjustment, notably the commutating field strength and brush position. This information is obtaine... View full abstract»

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  • Increased capacity and interconnections of the Columbia gas and electric corporation

    Publication Year: 1941, Page(s):451 - 458
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    The electrical properties operated by the Columbia system are located in the southwestern quadrant of Ohio and in northern Kentucky. These properties are shown in figure 1. The actual operations are carried on by the Dayton group, and the Cincinnati group. View full abstract»

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  • Short-wave diathermy apparatus and frequency-control possibilities

    Publication Year: 1941, Page(s):459 - 463
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1147 KB)

    The general technique of applying short-wave diathermy has become firmly entrenched in the therapeutic repertoire of the medical profession during the past eight years. The clinical effectiveness of this particular physical treatment, along with the commercial development of apparatus suitable for applying this form of energy at an economical cost, has given it wide usage. In spite of the general ... View full abstract»

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  • Radiant heat — A full-fledged industrial tool

    Publication Year: 1941, Page(s):464 - 470
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    Although the great majority of commercial heat sources deliver an appreciable portion of their energy in the infrared spectrum, most industrial heating processes now rely on heat transfer by convection. With the intermediate heating of the air between the source and the point of useful work, two or more energy transfers result with consequent loss in speed of transfer and efficiency while the avai... View full abstract»

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  • The application of ignitrons to resistance-welding control

    Publication Year: 1941, Page(s):471 - 478
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1969 KB)

    Since the development of the ignitron several papers have been presented which pertain to the theory of operation1,2,5 and explain its contribution to the recent advancement in the field of resistance-welding control.7,8,9,12 The object of this paper is to review the ignitron characteristics and to point out the operating principles, which should be considered in order to ins... View full abstract»

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Aims & Scope

This Periodical ceased publication in 1963. The current retitled publication is IEEE Spectrum.

Full Aims & Scope